Method behavior and state on g void playo i sound Player play Sound(title) title State (knows 所有实例的pay方法都是一样的 play0方法的行为将因ttle的不同而不 set Title Behavior setArtisto(does Song"Travel Song Sing layo Song t1=new Songo Song t2=new Songo t1 setTitle(“ Travel) t2 setTitle(“Sing); t1 play( t2. play 0:Method Song title artist setTitle() setArtist() play() State (knows) Behavior (does) void play() { soundPlayer.playSound(title); } 所有实例的play方法都是一样的； play()方法的行为将因title的不同而不 同。 Song t1=new Song(); t1.setTitle(“Travel”); t1.play(); Song t2=new Song(); t2.setTitle(“Sing”); t2.play(); Song “Travel” Song “Sing” behavior and state